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Flatheaded appletree borers (FAB) (Chrysobothris femorata Olivier) pose a significant risk to field production of shade and flowering trees because attack by one larva can render a tree unsalable. This insect attacks wounded and stressed trees, susceptible cultivars, or newly transplanted trees that might be stressed by desiccation, high temperature or both. The insect is managed by a combination of monitoring and scouting using purple panel traps, growing degree days and plant phenology, and use of chemical insecticides. An observational study of field-planted liners of ‘Royal Red’ Norway maple (Acer platanoides L.) determined that FAB only attacked the area directly around the stubbed portion of the rootstock at the union where the cultivar was budded. Trees with the stubbed area facing north or northeast were 46 to 61% less likely to be attacked by FAB than if the stubbed area was facing southwest.

Incidence and Severity of Buprestid Infestation in Field-Grown Acer platanoides Related to Cardinal Orientation of Understock Bud Union